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I tried to pre-transcode but it ignored the transcoded version and still tried to play the native avi file although not 100% sure if I should have waited until the pre-transcode had finished before i attempted to play.

On the TV I get the spinning arrow, then I see the file name being streamed, then the Mezzmo logo appears on the TV, thats it.

The Chromecast does not officially support avi files so this might be where the problem lies. The profile does not have any support for avi files indicated, if transcoding is on then Mezzmo will transcode avi files to play them on the Chromecast. Avi files are similar to matroska files so the chromecast may be able to play some without transcoding but since they are not officially supported it may be hit and miss where a small difference can cause the file to fail to play. The best approach is to turn on transcoding for the device in Mezzmo so that they are transcoded by default. If you pre-transcode you will need to make sure to refresh the file listing in the app you are using to stream to the chromecast, using Mezzmo Android a browse is done automatically for the selected file before playing to get the correct item listing but other apps may not do this.

The problem I can see is to get a previous problem working you suggested using the Ultra profile and the Chromecast Ultra will support HEVC but the 2nd & 3rd Gen do not and you do not have a Gen 2/3 profile which falls between the two profiles.

The only difference between the Chromecast and Chromecast Ultra profiles is the support for HEVC, so if the HEVC files do not play you should change to the Google Chromecast profile so that they will be transcoded.

Hi Peter, I swapped over to the Ultra profile because of support for AC3 in the earlier profile because early chromecasts would just play this audio. If I swap back it will start to try and pass through the audio again for those files.

I seen to be stuck needing both profiles and having to either manually transcode or continually swap profiles depending on the file type.

Ok, I have no idea why at the very start I had a problem with E-AC3 files wanting to pass the audio to a separate decoder but the problem has vanished, it was because of this problem you sent me the Ultra profile to test.

So back to the standard profile I have checked a sample of every file type I have with both with a 2nd Gen & a new 3rd Gen and can say every file plays apart from one exception, the full details of my tests are attached but the only file type I cannot get to play is:

This file will be streamed without transcoding so it could possibly be due to the 6 audio channels, do you have any other files with 6 audio channels that play? It could also be due to the embedded subtitles.